Re investment in the same stock need more thorough evaluation before re invest.

Initially investment in stock gained profit but too optimistic with the market and continue to re invest same stocks but never realised what goes up will have chances to eventually come down, thus eventually suffered losses. Lesson learnt is that after gained profit from a stock, need to more thoroughly evaluate the same stock if want to continue to invest on it to see whether it has reach the saturation point and coming down soon.